package com.springboot.mybatis.common.util;

import java.io.File;

import javax.annotation.Resource;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

@Service
public class MailUtil {
        private final Logger logger = LoggerFactory.getLogger(this.getClass());
     
        @Resource
        private JavaMailSender sender;
     
        @Value("${spring.mail.username}")
        private String from;
     
        /**
         * 发送纯文本的简单邮件
         * @param to
         * @param subject
         * @param content
         */
        public void sendSimpleMail(String to, String subject, String content){
            SimpleMailMessage message = new SimpleMailMessage();
            message.setFrom(from);
            message.setTo(to);
            message.setSubject(subject);
            message.setText(content);
     
            try {
                sender.send(message);
                logger.info("简单邮件已经发送。");
            } catch (Exception e) {
                logger.error("发送简单邮件时发生异常！", e);
            }
        }
     
        /**
         * 发送html格式的邮件
         * @param to
         * @param subject
         * @param content
         */
        public void sendHtmlMail(String to, String subject, String content){
            MimeMessage message = sender.createMimeMessage();
     
            try {
                //true表示需要创建一个multipart message
                MimeMessageHelper helper = new MimeMessageHelper(message, true);
                helper.setFrom(from);
                helper.setTo(to);
                helper.setSubject(subject);
                helper.setText(content, true);
     
                sender.send(message);
                logger.info("html邮件已经发送。");
            } catch (MessagingException e) {
                logger.error("发送html邮件时发生异常！", e);
            }
        }
     
        /**
         * 发送带附件的邮件
         * @param to
         * @param subject
         * @param content
         * @param filePath
         */
        public void sendAttachmentsMail(String to, String subject, String content, String filePath){
            MimeMessage message = sender.createMimeMessage();
     
            try {
                //true表示需要创建一个multipart message
                MimeMessageHelper helper = new MimeMessageHelper(message, true);
                helper.setFrom(from);
                helper.setTo(to);
                helper.setSubject(subject);
                helper.setText(content, true);
     
                FileSystemResource file = new FileSystemResource(new File(filePath));
                String fileName = filePath.substring(filePath.lastIndexOf(File.separator));
                helper.addAttachment(fileName, file);
     
                sender.send(message);
                logger.info("带附件的邮件已经发送。");
            } catch (MessagingException e) {
                logger.error("发送带附件的邮件时发生异常！", e);
            }
        }
     
        /**
         * 发送嵌入静态资源（一般是图片）的邮件
         * @param to
         * @param subject
         * @param content 邮件内容，需要包括一个静态资源的id，比如：<img src=\"cid:rscId01\" >
         * @param rscPath 静态资源路径和文件名
         * @param rscId 静态资源id
         */
        public void sendInlineResourceMail(String to, String subject, String content, String rscPath, String rscId){
            MimeMessage message = sender.createMimeMessage();
     
            try {
                //true表示需要创建一个multipart message
                MimeMessageHelper helper = new MimeMessageHelper(message, true);
                helper.setFrom(from);
                helper.setTo(to);
                helper.setSubject(subject);
                helper.setText(content, true);
     
                FileSystemResource res = new FileSystemResource(new File(rscPath));
                helper.addInline(rscId, res);
     
                sender.send(message);
                logger.info("嵌入静态资源的邮件已经发送。");
            } catch (MessagingException e) {
                logger.error("发送嵌入静态资源的邮件时发生异常！", e);
            }
        }

}
